Polyurethane foam strips to estimate parasitism of hemlock looper (Lepidoptera: Geometridae) eggs by Telenomus spp. (Hymenoptera: Scelionidae)

2006 ◽  
Vol 138 (1) ◽  
pp. 114-117 ◽  
Author(s):  
Christian Hébert ◽  
Richard Berthiaume ◽  
Clément Bordeleau
Keyword(s):  
Polyurethane Foam ◽  
Extraction Process ◽  
Population Management ◽  
New Method ◽  
Standard Tool ◽  
Egg Parasitism ◽  
Hemlock Looper ◽  
Oviposition Trap

AbstractAn oviposition trap recently developed to survey hemlock looper (Lambdina fiscellaria (Guenée)) eggs and consisting of a small strip of white polyurethane foam stapled to the tree bole provides reliable estimates of Telenomus spp. parasitism on hemlock looper eggs. Oviposition traps are a standard tool that never varies. They allow us to avoid the tedious and expensive extraction process used when collecting eggs from branches. This new method can be implemented rapidly in a high number of plots and provides the egg parasitism estimates needed in spring to improve hemlock looper population management.

scholarly journals Analog Accelerator for Simulation and Diagnostics

2020 ◽  
Vol 34 (08) ◽  
pp. 13261-13266
Author(s):  
Alexander Feldman ◽  
Ion Matei ◽  
Emil Totev ◽  
Johan De Kleer
Keyword(s):  
Numerical Integration ◽  
Integrated Circuit ◽  
Numerical Algorithms ◽  
New Method ◽  
Analog Computing ◽  
Computing Unit ◽  
Programmable Analog ◽  
Standard Tool ◽  
Field Programmable ◽  
Analog Arrays

We propose a new method for solving Initial Value Problems (IVPs). Our method is based on analog computing and has the potential to almost eliminate traditional switching time in digital computing. The approach can be used to simulate large systems longer, faster, and with higher accuracy. Many algorithms for Model-Based Diagnosis use numerical integration to simulate physical systems. The numerical integration process is often either computationally expensive or imprecise. We propose a new method, based on Field-Programmable Analog Arrays (FPAAs) that has the potential to overcome many practical problems. We envision a software/hardware framework for solving systems of simultaneous Ordinary Differential Equations (ODEs) in fraction of the time of traditional numerical algorithms. In this paper we describe the solving of an IVP with the help of an Analog Computing Unit (ACU). To do this we build a special calculus based on operational amplifiers (op-amps) with local feedback. We discuss the implementation of the ACU on an Integrated Circuit (IC). We analyze the working if the IC and simulate the dynamic Lotka-Volterra system with the de-facto standard tool for electrical simulation: Spice.

scholarly journals INVESTIGATION OF THE APPLICATION OF A NEW METHOD OF EXTRACTION INTENSIFICATION OF PECTIN SUBSTANCES FROM A BEET PULP

2018 ◽  
Vol 4 ◽  
pp. 21-28
Author(s):  
Gregoriy Deynichenko ◽  
Vasyl Guzenko ◽  
Dmytro Dmytrevskyi ◽  
Vitalii Chervonyi ◽  
Tatiana Kolisnichenko ◽  
...  
Keyword(s):  
Raw Materials ◽  
Experimental Studies ◽  
Extraction Process ◽  
New Method ◽  
Acid Extraction ◽  
Regression Equations ◽  
Technological Parameters ◽  
Beet Pulp ◽  
Working Parameters ◽  
Pectin Substances

The aim of research is studying a new method for intensifying extraction of pectin substances during acid extraction of pectin-containing raw materials. The description of the experimental setup and the procedure for processing the results of the investigation of the application of a new method for intensifying the beet pulp extraction are described. The results of experimental studies on the application of a new combined mixing element for intensifying the extraction of pectin-containing raw materials (beet pulp) and its effect on quantitative and qualitative output characteristics are presented. Mathematical models are constructed on the basis of regression equations of the full factorial experiment with the use of a new method of intensifying the extraction process to select input technological parameters for the extraction of pectin substances from pectin-containing raw materials. The rational operating parameters of the process of extraction of pectin substances with the use of a new combinable stirring element are determined. Such working parameters are: the process duration is 1 ... 1.1, the temperature of the working medium is 60 ... 70 ºС, and the hydromodule is 8 ... 10. The research results can be used to study other technological parameters of the extraction process of pectin substances, as well as to develop a technological line for the production of pectin products.

A new method for fast extraction and determination of chlorophylls in natural water

2018 ◽  
Vol 73 (1-2) ◽  
pp. 77-86 ◽  
Author(s):  
Nianwei Qiu ◽  
Xiushun Wang ◽  
Feng Zhou
Keyword(s):  
Natural Water ◽  
Chlorophyll Concentration ◽  
Extraction Process ◽  
New Method ◽  
Dilution Ratio ◽  
Centrifuge Tube ◽  
Fast Extraction ◽  
Chlorophyll Extraction ◽  
Chlorophyll Concentrations

Abstract Algae collection and chlorophyll extraction are two troublesome steps in the traditional methods used for the determination of chlorophyll concentration in natural water. A new method was established in this study for fast collection and extraction of chlorophyll. Based on our results, the optimum centrifugation condition for collecting algae was determined as: 5000 g for 15 min at 4 °C, and the optimum dilution ratio of dimethyl sulfoxide: 90% acetone was 1:4. The specific steps were as follows: the algae in water samples were collected by centrifugation at 5000 g at 4 °C for 15 min. The precipitated algae were suspended with 2 mL DMSO. Then the sample was transferred to a 15 mL centrifuge tube, and the tube was incubated at 65 °C for 1–2 h in the dark until the sample turned white. After cooling, the chlorophyll extract was diluted with 8 mL 90% acetone, before centrifugation at 5000 g for 5 min. The absorbance values of the supernatants at 750, 664, 647 and 630 nm were used for the calculation of chlorophyll concentrations by the trichromatic equations. This new method saved the filter cost, simplified the extraction process, improved the algae acquisition efficiency, and accelerated the chlorophyll extraction rate.

OVIPOSITION TRAP TO SAMPLE EGGS OF OPEROPHTERA BRUCEATA (LEPIDOPTERA: GEOMETRIDAE) AND OTHER WINGLESS GEOMETRID SPECIES

1999 ◽  
Vol 131 (4) ◽  
pp. 557-565 ◽  
Author(s):  
Christian Hébert ◽  
Luc St-Antoine
Keyword(s):  
Polyurethane Foam ◽  
Host Tree ◽  
Egg Density ◽  
Fall Cankerworm ◽  
Bruce Spanworm ◽  
Oviposition Sites ◽  
Oviposition Trap

AbstractFor the last 50 years, populations of the Bruce spanworm, Operophtera bruceata Hulst, and other wingless geometrid species have been sampled using sticky bands placed around host-tree trunks to catch wingless females in search of oviposition sites. This method is tedious and, because of trap saturation by males, may underestimate female populations at moderate to high levels. A standard oviposition trap was developed to sample eggs of the Bruce spanworm and other wingless geometrid species. A small polyurethane foam band placed on a post covered by a Multi-Pher® plate detected low populations and was almost unsaturable during outbreaks. Sub-sampling can be easily done in such situations. Egg density on oviposition traps was higher than female density on sticky bands for both the Bruce spanworm and the fall cankerworm, Alsophila pometaria Harris. This suggests that the oviposition trap might be useful to sample other wingless geometrid species. Operating this system was easy and could involve woodlot owners and companies to reduce the traveling costs necessary to collect samples.

P-Box Theory and SVM Methods with Application in Pattern Recognition

2014 ◽  
Vol 651-653 ◽  
pp. 472-475
Author(s):  
Jia Man Ding ◽  
Yi Du ◽  
Qing Xin Wang ◽  
Ying Jiang ◽  
Lian Yin Jia
Keyword(s):  
Pattern Recognition ◽  
Feature Extraction ◽  
Information Source ◽  
Recognition Rate ◽  
Extraction Process ◽  
Information Loss ◽  
New Method ◽  
Uncertainty Measures ◽  
Different Types ◽  
Traditional Pattern

In order to solve the problem of the information loss on the feature extraction process in the traditional pattern recognition, a new method based on probability boxes theory was proposed. Firstly, the skewness of the fault signal data were used as the information source to construct the tow p-boxes about X and direction. Then, to take advantage of the complementation of the information source, the tow p-boxes from different directions were fused. Finally, the SVM features database was established by extracting different types of cumulative uncertainty measures from p-boxes. The analysis result shows that the combination of p-box and SVM can achieve a high recognition rate, which makes a new way for pattern recognition.

A new method for isolating (E)-azastilbene derivatives with antimicrobial properties from aqueous samples

2018 ◽  
Vol 47 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Mariusz Kluska ◽  
Ewa Witkowska-Krajewska ◽  
Wiesław Prukała
Keyword(s):  
Waste Water ◽  
Stationary Phases ◽  
Antimicrobial Properties ◽  
Extraction Process ◽  
New Method ◽  
Aqueous Samples ◽  
Long Term Stability ◽  
Water Test ◽  
The Stability

Abstract This paper presents the results of a study aimed at developing the extraction process and determining long-term stability of (E)-azastilbene derivatives in order to explore their possible use as preservative, antiseptic and disinfectant substances. The study was performed in three different matrices: distilled, surface and waste water. Test substances included bromide of (E)-N-(o-bro-mobenzyl)-4′-hydroxystilbazole-4 and chloride of (E)-N-(p-chlorobenzyl)-4′-hydroxystilbazole-4. The extraction process involved the use of three stationary phases: octyl, octadecyl and naphthylpropyl. The highest recovery values (amounting to approx. 95%) were obtained in the naphthylpropyl column for all of the above-mentioned matrices. A decline in the stability of the analysed derivatives after a 28-day period was below 14% in all matrix types.

scholarly journals Experimental investigation on surface characterization of chemical treated Natural fiber composite

2016 ◽  
Vol 12 (11) ◽  
pp. 4500-4506
Author(s):  
Prasanna Chandrasekeran ◽  
Ramesh C
Keyword(s):  
Chemical Treatment ◽  
Surface Characterization ◽  
Natural Fiber ◽  
Fiber Composite ◽  
Research Work ◽  
Extraction Process ◽  
New Method ◽  
Coir Fiber ◽  
High Oxygen Content ◽  
Fiber Loading

In this research work removal of lignin and hemicelluloses for untreated coir fiber reinforced composites was accomplished by suitable chemical treatment namely new method at optimum fiber loading such as 25% and 30%. To avoid the problem of untreated coir fiber, chemical treatment was done. Final treated fiber extraction process was gone through new method. It results in treated cellulose composite at 25% and 30% lignin and hemicelluloses was found to be decreased was revealed in Fourier transform infrared spectroscopy analysis, it shows defibrillation, de-polymerization in treated composite was revealed in scanning electron microscopy analysis, and shows high oxygen content percentage than carbon content percentage about 22.06% which demonstrates removal of lignin in treated composite, was revealed in element detection analysis.. The main objective was accomplished by the removal of lignin and hemicelluloses of natural fiber through suitable chemical treatment and at optimum fiber loading

Interpenetrating Network Metal-Ceramic FGM – Preparation and Properties

2009 ◽  
Vol 631-632 ◽  
pp. 471-476
Author(s):  
Matthias Neukam ◽  
Monika Willert-Porada
Keyword(s):  
Metal Powder ◽  
Polyurethane Foam ◽  
Metal Foam ◽  
Slip Casting ◽  
New Method ◽  
Interpenetrating Network ◽  
Metallic Part ◽  
Metal Ceramic ◽  
Ceramic Slip

A new method for processing large flat compositionally graded metal-ceramic parts with connected interpenetrating metal and ceramic network is described. Based on powder metallurgical methods, a metal foam is obtained by slip casting of metal powder slurries on a polyurethane foam, and used as preform to achieve a metallic interpenetration within the composite. The porous metallic preform is infiltrated with a ceramic slip and co-sintered. The metallic part is made from Ni-Cr-alloy, or the P/M superalloy Saratherm 2 and Nimonic 90, the ceramic consists of pure 8Y-ZrO2 or zirconia mixed with ZrSiO4. Composites of nominal same composition sintered without the metal foam preform show no metallic interpenetration.

Recovery of Rubber and Cotton from Uncured Tire Ply Scrap. Extraction Process

1931 ◽  
Vol 4 (3) ◽  
pp. 450-455
Author(s):  
Charles S. Powell
Keyword(s):  
Solvent Extraction ◽  
Cotton Fabric ◽  
Extraction Process ◽  
Difficult Problem ◽  
The Other ◽  
New Method ◽  
Rubber Cement ◽  
Shoe Soles

Abstract A new method for reclaiming uncured tire ply scrap is described. This is an application of the familiar solvent-extraction process. It possesses several advantages over the other methods of separating the rubber and cotton fabric in the scrap, particularly from the standpoint of waste of materials, for both the cotton and the rubber are completely reclaimed without deterioration. If the process is to have wide application, however, means must be devised for utilizing the dilute rubber cement produced. THE utilization of tire trims has always been a difficult problem. Composed of uncured rubber and long staple cotton, their value is considerable. Certain quantities, after being broken down on a mill, can be used in bead covers, flaps, shoe soles, and mats without detrimental effects. The Dunlop Rubber Company (2) has been granted a patent covering a composition of uncured ply scrap, ground scrap, etc., to be used in the manufacture of objects of fibrous rubber.

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